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\documentclass[12pt,a4paper]{report}\usepackage{amsmath}\usepackage[T1]{fontenc}\usepackage{mathptmx}\begin{document}The Zeeman Hamiltonian can be written as\begin{eqnarray}\mathcal{H}_z &=& -{\mu . B} \\&=& -\mu_z . B_z = -\hbar {I_z} \gamma B_0 = -\hbar \omega_0 {I_z},\end{eqnarray}\end{document}